Вао+ Н2О. -Ва(ОН)2
SO3+H2O---H2SO4
Na2O+ H2O----2NaOH
3Li2O+P2O5=2Li3PO4
SO3 + 2KOH =K2SO4 + H2O
CxHy+Cl2=CxHyCl+HCl
M(CxHy)= 12n+1^2n=14n
m(CxHy)=2,8
V(Cl2)=2.24
Vm(Cl2)=22/4
14n=(22.4^2.8)^2.24=28
n=2
Формула алкена: С2Н4
дано
m(HCL) = 15 g
------------------------
m(KOH)-?
KOH+HCL-->KCL+H2O
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 15 / 36.5 = 0.41 mol
n(KOH) = n(HCL) = 0.41 mol
M(KOH) = 56 g/mol
m(KOH) = n*M = 0.41*56 = 22.96 g
ответ 22.96 г